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Seth Castillo

Seth Castillo

Seth Castillo is an estimator at Coryell Roofing and Construction, Inc. (Coryell Roofing). Seth’s experience during his seven-plus years with the company uniquely qualifies him for this position: he has been a site manager for Residential Shingles, project manager, branch manager of the West Texas Division, safety director, and senior project manager. Before coming to work for Coryell Roofing, Seth was a manager/painter for a truck body shop and a shop manager/welder for Hughes Trailers. From these jobs, he learned patience and gained a better understanding of how to handle people and situations. Seth was pursuing a masters in behavioral psychology through Ashford University when he decided to pause and work for Coryell Roofing; he intends to one day return and complete the behavioral psychology program.
Seth likes working for a “small feel” company that is doing very large things. He is constantly amazed at how well the hardworking guys and gals get along and get things done to make Coryell Roofing the powerhouse it has become, and he shouts out, “WE ARE CORYELL!!”. Seth lives by Gandhi’s belief that “You must be the change you wish to see in the world,” and he believes he must be the change he wants to see in others in order to cultivate a better workplace, community, and world. Seth unwinds from a busy week as estimator for Coryell Roofing by spending time with his family–wife, Stephanie,  their daughter, his stepson, and their little dog, Chi-Chi. He also enjoys bass fishing, whether in tournaments or just for fun.


  • HAAG Certified Commercial Roof Inspector
  • HAAG Certified Residential Roof Inspector
  • Certainteed Master Shingle Applicator Wizard
  • Duro-Last Certified Sales Training
  • Subrogation Certification
  • Xactimate Level 3 Certified
  • OSHA 10 Hour Construction Safety Certified
  • OSHA Certified Forklift Operator
  • Duro-Last Certified Installer
Coryell Roofing awarded the Duro-Last Chairman Award in 2014.
Coryell Roofing awarded the Duro-Last Chairman Award in 2018.
Coryell Roofing awarded the Duro-Last Golden Eagle award in 2017.
Coryell Roofing awarded the Duro-Last Golden Eagle award in 2020.
Coryell Roofing awarded the Duro-Last Golden Eagle Award in 2021.
Sika Sarnafil

Coryell Is A Member Of The National Roofing Contractors Association
Associated General Contractors Of America
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International Facility Management Association Oklahoma City Chapter Logo
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Arkansas Association Educational Administrators
Arkansas Rural Ed Association
Missouri Association Of School Administrators
Missouri School Plant Managers Association
Organization Of Rural Oklahoma Schools
Friends Of Texas Public Schools
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Best Roofers in Oklahoma City
Coryell Roofing & Construction, Inc. BBB Business Review